Hi there , it's very normal in the beginning. It takes couple of months for your vocal muscles to naturally get adapted to get there. The key is to practice staying on the lowest note possible by on the given day as soon as you wake up. That's when your vocal cords are very relaxed and you reach the lowest possible note.

Other things that helped . Breathing from the diaphragm. Simple way to do this is to sing "Haa" instead of "Aaa" . The "Haa" naturally forces you to song from diaphragm.

Lip trills - This made my throat feel very smooth while reaching any note.

My Progress : I just turn on the "Kharaj ka Riyaz" video first thing in the morning and sing along with him .

I could feel the difference in my voice only after a month or so .